I have solved this temporarily.
The GRUB menu can be unhidden by commenting out the two lines regarding
GRUB_HIDDEN in /etc/defaults/grub and running update-grub as root.
Next, the entry for windows can be manually added by appending the following
lines to /etc/grub.d/40_custom:
menuentry "Windows" {
search --fs-uuid --no-floppy --set=root YOUR-EFI-PARTITIONS-UUID-HERE
chainloader (${root})/efi/Microsoft/Boot/bootmgfw.efi
}
Find your EFI partitions UUID by running 'ls -la /dev/disk/by-uuid/'. As
the EFI partition is a FAT32 partition, the UUID is of the form XXXX-
XXXX. If you have more than one FAT partition, you can verify if one is
the EFI partition by checking the partition map with gdisk (not
installed by default). Run gdisk on the device, 'sudo gdisk
/dev/DEVICE', press 'p' to print the partition table, and then 'q' to
quit. DON'T make any changes to the partition table. The EFI partition
will have the code type 'EF00' and most likely a name/label that says it
is a EFI system partition.
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https://bugs.launchpad.net/bugs/807801
Title:
grub-update fails to detect windows bootloader on a uefi system
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